titles do not appear more than 1 time

Bug

 

If you win dragon, you go to the portal, the next you can see title, but

if you return to the end and jump in to the poratl agan, you can't see the titles

 

How Check?

• create world
• /set block ~ ~ ~ end_portal
• /kill @e[type=ender_dragon]
• go to the portal
• set block ~ ~ ~ end_portal (agan)
• go to the portal (agan)
• and you can't see nothing 

 

 

 

 

(sorry for my English)